The paper length is not relevant since the chart flows from one page to the next.
Mobile
in.
mm
Portrait
2.75
70
For smart phones, not for printing
Landscape
5.5
140
For smart phones, not for printing
USA & Canada
in.
mm
Letter Portrait
8.5
216
Also Legal Portrait
Letter Landscape
11
279
Legal Landscape
14
356
Also Ledger Portrait
Ledger Landscape
17
432
International
in.
mm
A5 Portrait
5.82
148
A4 Portrait
8.25
210
Also A5 Landscape
A4 Landscape
11.71
297
Also A3 Landscape
A3 Landscape
16.54
420
The Text+ programs assume that the right and left margins are each about 25mm (1/2 inch) wide.
On the Format for Printing page, differences in page margins can be accommodated by the "fudge factor":
Mary Ellen SPEARS
(29 Jun 1894 Raglan, Victoria, Australia - 7 Dec 1974 Perth, Western Australia, Australia)
Otto Vivian PETERS (13 Nov 1889 Caltowie, South Australia, Australia - 3 Dec 1981 Perth, Western Australia, Australia)(m. 19 Aug 1916 Boulder, Western Australia, Australia)
└─Walter Vivian Ernest PETERS (9 Oct 1919 Kalgoorlie, Western Australia, Australia - 19 Apr 2003 Albany, Western Australia, Australia)
Frances Boronia BENNETT (27 Jul 1925 Perth, Western Australia, Australia - 10 Sep 1992 Albany, Western Australia, Australia)(m. 1944 Perth, Western Australia, Australia)
1894 - 1974 (80 years)
Otto Vivian PETERS 
(13 Nov 1889 Caltowie, South Australia, Australia -